Hi! If you go on the websites www.justmommies.com or www.babycentre.co.uk both have information about the ideal time for intercourse that leads to conception. The 1-2 days BEFORE ovulation are apparently most likely to lead to conception. They say even dtd 3-4 days before ovulation is more likely to result in conception than on the day of ovulation itself (which surprised me!). If you dtd the morning of the day you got your LH surge it sounds like you're in with a good chance! Good luck!